javascript最短的拖动代码[兼容FF]

发帖时无法插入可运行代码?
以下为程序代码:





var x,y
var drag_=false
var D=new Function('obj','return document.getElementById(obj);')
var IE=new Function('','if(navigator.appName.indexOf("Explorer")>=0)return 1;if(navigator.appName.indexOf("Netscape")>=0)return 2')
function Move_obj(obj){//1
D(obj).onmousedown=function(e){drag_=true//4
with(this){style.position="absolute";temp1=offsetLeft;temp2=offsetTop;//5
if(IE()==1){x=event.clientX;y=event.clientY//6
document.onmousemove=function(e){//7
if(drag_==false)return false
with(this){style.left=temp1+event.clientX-x+"px";style.top=temp2+event.clientY-y+"px"}
}//7
}//6
if(IE()==2){x=e.pageX;y=e.pageY;//8
document.onmousemove=function(e){//9
if(drag_==false)return false
with(this){style.left=temp1+e.pageX-x+"px";style.top=temp2+e.pageY-y+"px"}
}//9
}//8
}//5
document.onmouseup=new Function("drag_=false")
}//4
}//1


这个是可以拖动的层

[Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]